CONSIDERATIONS TO KNOW ABOUT CMMG MK57

With a lot of the special projectiles I'd handy — most notably the massive, 55 grain subsonic rounds from Detroit Ammo Co (not pictured) — the bullet-formed grooves inside the entrance from the FN journal didn’t Perform nicely.The two ProMags I employed worked flawlessly, along with the factory 5-seveN mag I had did not. I’ll admit my stand